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There’s a ring to set the floating stir bar.
When the water reach certain level, the stir bar will float according to the water level and touch user’s finger. It helps to signal people about the water level when they have to pour water in dark area or when they cannot see it well.
Kaohsing city, Taiwan
Bo Zong Shiu,
National Cheng Kung University
Chin Wen Kow,